25.0 g of a hydrocarbon undergoes complete combustion leading to the formation of 77.0 g of CO2. What is the % of carbon in the hydrocarbon?
Question
25.0 g of a hydrocarbon undergoes complete combustion leading to the formation of 77.0 g of CO2. What is the % of carbon in the hydrocarbon?
Solution
Para resolver este problema, sigamos los siguientes pasos:
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Determinar la cantidad de carbono en el CO2 producido:
- La masa molar del CO2 es 44.0 g/mol (12.0 g/mol de C + 2 * 16.0 g/mol de O).
- La masa molar del carbono (C) es 12.0 g/mol.
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Calcular los moles de CO2 producidos:
- Moles de CO2 = masa de CO2 / masa molar de CO2
- Moles de CO2 = 77.0 g / 44.0 g/mol
- Moles de CO2 = 1.75 mol
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Calcular la masa de carbono en el CO2 producido:
- Cada mol de CO2 contiene 1 mol de carbono.
- Masa de carbono = moles de CO2 * masa molar del carbono
- Masa de carbono = 1.75 mol * 12.0 g/mol
- Masa de carbono = 21.0 g
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Calcular el porcentaje de carbono en el hidrocarburo:
- % de carbono = (masa de carbono / masa del hidrocarburo) * 100%
- % de carbono = (21.0 g / 25.0 g) * 100%
- % de carbono = 84.0%
Por lo tanto, el porcentaje de carbono en el hidrocarburo es 84.0%.
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